Bracket filling FAQ
By Mario Bailey · Published · Last reviewed
Every answer below uses 2026 figures computed by the same engine as the calculator. Where an answer depends on your numbers, it says so and links the page that computes it.
Is bracket filling worth it?
It depends entirely on the gap between your conversion-year rate and your RMD-era rate. For the calculator's default scenario (MFJ couple, $1.4M traditional IRA), the recommended strategy saves $229,212 in lifetime tax and IRMAA versus doing nothing. With a small traditional balance or an already-low retirement bracket the answer can be no: see when not to do it.
How much can I convert in 2026 without entering the next bracket?
Up to the gap between your taxable income and your bracket ceiling. The 22% bracket ends at $211,400 taxable income for married filing jointly and $105,700 for single filers in 2026. The per-bracket pages tabulate headroom at common income levels.
Does bracket filling avoid IRMAA?
Not automatically; it can trigger it. Medicare premiums rise at MAGI thresholds ($109,000 single, $218,000 MFJ in 2026) measured with a two-year lookback, so a conversion at 63 raises premiums at 65. The calculator flags every tier crossing per scenario.
Can I still do bracket filling after RMDs start?
Yes, but the RMD comes out first and cannot itself be converted. RMDs begin at age 73 for those born 1951-1959 and 75 for those born 1960 or later. Each year's RMD consumes bracket space before any conversion, which is why the window before your beginning date is more valuable.
What is the deadline for a conversion?
December 31 of the tax year. Unlike IRA contributions, conversions have no April grace period: a conversion executed in January counts for the new year.
Can I undo a conversion if I overshoot the bracket?
No. Recharacterization of conversions was repealed effective 2018 (IRC 408A(d)(6)). Overshooting is permanent, which is the argument for converting to a computed target rather than a round number.
Does a conversion make my Social Security taxable?
It can raise the taxable share. The provisional income formula phases up to 85% of benefits into taxable income as MAGI rises; a conversion adds dollar for dollar to that formula in the conversion year. The calculator computes the interaction rather than applying a flat percentage.
Do states tax bracket-filling conversions?
Forty-one states plus D.C. tax conversions as ordinary income; eight states have no income tax, Washington taxes only capital gains, and several states with an income tax (Illinois, Iowa, Mississippi, Pennsylvania) exclude retirement income, making conversions effectively state-tax-free at retirement age. Every state has a computed page on this site.
Is bracket filling the same as a Roth conversion ladder?
No. A ladder converts a fixed amount annually to create penalty-free access five years later, optimizing for early-retirement liquidity. Bracket filling converts a computed amount annually to a bracket ceiling, optimizing lifetime tax. The comparison guide works a scenario both ways.
Should I pay the conversion tax from the IRA or from savings?
From savings, if you can. Withholding the tax inside the conversion shrinks what reaches the Roth: converting $50,000 at a 22% marginal rate with 22% withheld lands only $39,000 in the Roth, versus the full $50,000 when the $11,000 is paid from a taxable account. Under 59.5 the withheld portion is also itself a penalized early distribution.
Does converting reduce future RMDs?
Dollar for dollar. An RMD is the prior December 31 traditional balance divided by the IRS Uniform Lifetime divisor, so every $100,000 converted before your beginning date cuts the age-75 RMD by about $4,065 that year, and the avoided amount grows each year as the divisor falls with age.
Does the five-year rule matter if I convert after 59.5?
Not for the converted principal: the 10% recapture penalty cannot apply once you are 59.5. What still matters is the separate one-time clock on earnings, which starts January 1 of the year of your first-ever Roth contribution or conversion and must reach five taxable years before earnings come out tax-free. First-time converters at 60 or older start it with any amount, even a small one, this year.